Question

The chemical standard for the quantity of a mole is based on which substance?

A.oxygen-16

B. carbon-12

C. hydrogen-1

D. helium-2
A is what i think

Answer 1

@Secret-Ninja

Answer 2

@Secret-Ninja

Answer 3

@Tazmaniadevil

Answer 4

@Taylev105

Answer 5

@Secret-Ninja

Answer 6

@Secret-Ninja

Answer 7

The mole is a unit of measurement used in chemistry to express amounts of a chemical substance, defined as the amount of any substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12 (12C), the isotope of carbon with relative atomic ...

http://en.wikipedia.org/wiki/Mole_%28unit%29
I would choose B. Carbon but I haven't learned this so I am not sure if its right. :p I hope this helps. Sorry for being late.